/*
 * Copyright 2013 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.grails.web.databinding.converters

import grails.databinding.converters.ValueConverter;
import groovy.transform.CompileStatic

import org.springframework.web.multipart.MultipartFile

/**
 * @author Jeff Brown
 * @since 2.3
 */
@CompileStatic
class ByteArrayMultipartFileValueConverter implements ValueConverter {

    public Object convert(Object value) {
        MultipartFile mf
        if(value instanceof MultipartFile) {
            mf = (MultipartFile)value
        } else if(value instanceof Collection) {
            def coll = (Collection)value
            if(coll.size() > 0) {
                def firstElement = coll[0]
                if(firstElement instanceof MultipartFile) {
                    mf = (MultipartFile)firstElement
                }
            }
        }
        mf?.bytes
    }

    public Class<?> getTargetType() {
        byte[]
    }

    public boolean canConvert(Object value) {
        def canConvertValue = false
        if(value instanceof MultipartFile) {
            canConvertValue = true
        } else if(value instanceof Collection) {
            if(value.size() > 0 && ((Collection)value)[0] instanceof MultipartFile) {
                canConvertValue = true
            }
        }
        canConvertValue
    }

}
